<div dir="ltr"><div>Hello,<br><br></div>Software, unfortunalty. This is something I got recently from the Brocade support when I opened a case :<br><br>"in 5.4 & 5.5 code , BFD packet processing is done entirely in SW (with no HW assist). If the CPU is too busy, and a process is taking too much time to perform certain tasks (such as programming many routes), BFD packet processing can be delayed (in TX and RX directions), that then result in BFD flap.<br>
<br><br>What has improved in 5.6<br><br>Three things have been done to alleviate this situation in 5.6.<br>1. HW assist has been implemented in CER for BFD packets. This means that BFD packets are transmitted by HW. <br>
2. CPU optimizations have been added in BGP code so as not to use CPU for too long without yielding. This should help with flaps that were happening during route updates. <br>3. Other tasks have also been optimized to reduce their impact on all time-sensitive protocols.<br>
"<br><div class="gmail_extra"><br></div><div class="gmail_extra">I know, it's annoying.<br><br></div><div class="gmail_extra">HTH.<br><br></div><div class="gmail_extra">BR.<br><br><br></div><div class="gmail_extra">
<br></div><div class="gmail_extra"><br><div class="gmail_quote">2014-02-18 11:47 GMT+01:00 Darren O'Connor <span dir="ltr"><<a href="mailto:darrenoc@outlook.com" target="_blank">darrenoc@outlook.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div>Can anyone confirm if the CER does BFD in hardware or software? The config guide states 20 sessions, but no mention on LP or CPU based hellos</div>
<div><br></div><div>I've been seeing BFD flap on a cer when rancid logs and and gets config </div><div><br></div><div>Thanks<br><br><span style="font-size:15px;line-height:19px;white-space:nowrap">h</span><span style="font-size:15px;line-height:19px;white-space:nowrap">ttp://<a href="http://www.mellowd.co.uk/ccie" target="_blank">www.mellowd.co.uk/ccie</a></span></div>
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